Page 304 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

BALANCE SHAFT REMOVAL / INSPECTION 5. Inspect / replace the balance shaft bearings in both
crankcase halves. See “Crankcase Bearing
1. Rotate crankshaft to align the timing marks as shown
below. Inspection / Removal” procedure in this chapter.
NOTE
Due to extremely close tolerances and minimal wear,
counterbalance shaft ball bearings must be inspected
visually and by feel. Look for signs of discoloration,
scoring or galling. Turn the inner race of each bearing.
The bearings should turn smoothly and quietly. The
outer race of each bearing should fit tightly in the
crankcase bore. The inner race should be firm with
minimal side to side movement and no detectable up
and down (radial) movement.

2. Pull upward on the balance shaft and remove it from
the crankcase.

3. Inspect drive gear for broken or damaged teeth.
4. Inspect bearing surfaces for scoring or signs of wear.

3.182 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
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